Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6343649dd14814…

MALICIOUS

PDF

86.1 KB Created: 2021-07-27 13:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 082515c3ea4e8a8ef1192094c922a654 SHA-1: 2a521057d2820e0899e3d627b640330643d0e4b8 SHA-256: 9b6343649dd148145d457af372cce4be7d946772d447080a14b2d0849ea16a97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0ea2c2f2e45554d6740c530395793dd8/41982345085.pdf
    • http://www.asslar.de/downloads/87209534943.pdf
    • http://trendybiz.in/usersfiles/file/mipiveji.pdf
    • http://xedaptheduc.net/app/webroot/uploads/files/fimopojafakuzudogalon.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95fc4b1eee---31631485026.pdf
    • http://ndt-tl.ru/upload/file/23465584941.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qkspf9oalq21agkol8ubk7o2kh/24614266131.pdf
    • https://businesslife.com/content/files/23779709274.pdf
    • http://nemdanangpho.com/uploads/2021-05-28/images/files/fopuxatuwiluvamaxaro.pdf
    • http://axwelindia.com/uploads/33317113590.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/82fd24e50ffa63af9a1780ed20763eb1/denufoponegimiragalexano.pdf
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/96736915705.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/58dbd46eb6128d9a5d24cd8311a64f88/35488646067.pdf
    • http://mitra.su/uploads/ckeditor/files/8870962180.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/qg47fg5lg31ebr2fhbq7eoia40/59267394122.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cd6f600f8---91977307744.pdf
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/10369953922.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608613e788baf---90237510208.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/bm43c5h7h4h77927jjhkjtbbl2/11567098767.pdf
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/82591835973.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f7470a1f77a136f99b72af69f9083bf3/99729662023.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/643c2a6b9e8a515070fbea69549d46ca/63927757054.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/d5cc364b945520a27416534f8e6f9330/69788444394.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+remove+an+old+honeywell+thermostat
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed33.bin
c43ec22c5f61ad4da21e10ec480f7c6533d44c5fd0f9b3b1fe1b3649bdf79cf6
pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 17240 bytes
font_01_sfnt_off000119d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119D8 16792 bytes
font_02_sfnt_off000131ef.bin
1b7980c078e01b900f90450f798ec6e9132190e4b808b53745962c6aa19630e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x131EF 10676 bytes